Process of making dipolymer



i 30 along with a po rlginiefized by repassmg Patented Now 13, 1928 nwnr w. noun, or wm'ron, new mnsn comm, OF WIIMINGTON,

ASSIGNOB TO HERCULES POWDER DELAWARE, A CORPORATION OF DELAWARE.

.raocnss or we mronma.

10' Drawing.

:Ihe object of my invention is to'produce Dipolymer.

ipolymer,

is a product, consisting as the term is herein employed,

of polymerized ter- 8 pene hydrocarbons, which is obtained bypolymerizing dipentene, turpentine, or pine oil. Although it is largely composed of the Dipolymer 11 substantial proportions of higher pplymers, (O l-I are gen- 10 erally present. ipentene, as the term is here- I in emplo ed, refers to the cut of pine products boiling argely between 165 and 185 C., which is obtained in the steam distillation of pine wood. Pure dipentene boils at 17 46 (3., but the term dipentene as tended to. comprehend the crude product with the wider boiling range.

It is known to make Dipolymer in the liquid phase by treating turpentine or dipentene 20 with sulfuric acid of various concentratlons. I have discovered that it may be repa-red, in either a liquid phase or vapor p ase, by an entirely new process presenting distinct-advantages. 2 I have discovered that dipentene is largel converted into Di olymer by refluxing it wit a metallic chlori e. If desired, the heating may be 'so ad'usted that an water present will distill 0 during the eating period, of the light oil. The reactmn 1s: 1o 1c 1o 1e)2 10 10) In a t pical exam 1e, 200 gms. of dipentene were re uxed for a alf hour with 10 gms. oi stannic chloride (SnCl,.5H,O), forming 108 s. of Dipolymer. A portion of the lower iling oil can be converted into Dipolymer on-reheating with stannic chloride, para-cymene formed is not polymerized.

Polymerization of dipentene in the vapor 40 phase mag be carried out, at temperatures ranging om 17 5-550 CL, by passing the vapors of di ntene through a tube of iron or other suitab e material atsuch a rate as will permit the vapors to remain in contact with zinc chloride, contained )in' the tube, long enough to'cause partial polymeriaation. portion of the unpolymerized 011 ma be 'pentenemay beemployed, 1n

herein used is.1n'

ployed any may be employ but the through the" ube. groductwhich is obtained on.

Application fled July 20, 1928. Serial 110. 128,817.

some instances, without refining; but/it is usually preferable to distill off the lower boil- I ing end, cutting around 250 C. By this pro-v cedure, the hydrocarbons and any unaltered dlpentene are se arated, leaving a; residue consisting of cm e'Di olymer.

A typical sa-m'ple o a speci c gravity of 0.95, and the following boilin range: 5% over at 305 C., 20% at 326 at 335 C., 70% at 342 0., and 90% at 375 C. proximately 80% has distilled over, a product is obtained having A second cut may be made-comprising approximately the 80-95% portion of the crude Dipolymer. This cut is crude Dipolymer has If a cut is made when'apa specific gravity of 0.94.

exceedingly viscous and resembles a soft rosin. The residue is hard and brittle and has the appearance of a dark colored rosin; For some applications of the Dipolymer it may be desirable to separate; it into cuts as outlined above.

Itis believed that any of the metallic chlorides are workable. For example, in

place of stannic chloride,?there may be em- 0 of the chlorides of 'aluminum, 11'011, zinc and antimony.. Anhydrous me tallic chlorides are preferable to the hydrated,

but if a quite active metallic chloride, such as stannic chloride, is employed," the hydrated form may be practically as efiicient, if not preferable. A mixture of metallic chlorides ed. In certain cases it may bedesirable to utilize a metallic chloride as a constituent ofa catalytic mixture, as, for example, -ullers earth, or other silicious or argillaceous earth, impregnated with the me tallic chloride. V Having now fully described my invention, what I claim and, desire to protect by Letters Patent is i v The process of pre aring Dipolymer from dipen'tene w iich lncludes treating dipentene with heat in the presence of a metalic chloride for a sufficient time to efiect conversion thereof into di and higher polymers. In testimony of; which invention, I have hereunto set my hand, at Philadelphia, Penna, on-this 2nd day of July, 1926.

IRVIN w. HUMPim-EY. 

